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Application of nanosilver in swimming pool water treatment technology
Joanna Wyczarska-Kokot * , Florian Piechurski
1  Institute of Water and Wastewater Engineering, The Silesian University of Technology, Konarskiego 18, Gliwice, Poland

10.3390/ecws-2-04944
Abstract:

The paper presents the possibility of applying a colloidal solution of nanosilver in a closed circuit of swimming pool water treatment.

The applied nanosilver solution is characterized as having a very high biocidal effect, with no negative impact on the human and animal body, or the environment.

Because the tested swimming pool is primarily designed for the rehabilitation of disabled people, the water quality must be strictly kept and controlled.

Water quality was analyzed in the following system: prefiltration (mesh filter) - dosing of silver nanoparticle concentrate in the form of an aqueous solution - actual filtration (vacuum filter with multilayer bed) - UV irradiation (low pressure UV lamp) - final disinfection with NaOCl solution.

Samples of pool water for the control of water quality variation in the treatment cycle were taken from 5 points (from pool basin, retention tank, just before filter, just after filter and from water supply system replenishing water lost from swimming pool circuit).

The safety of water for bathing and rehabilitation was appraised by comparing the bacteriological and physicochemical tests results with admissible values specified in hygienic requirements for swimming pools (WHO, 2006: Guidelines for safe recreational water environments. Vol. 2: Swimming pools and similar environments, 2006; DIN 19643, 2012: Water treatment for swimming and bathing pools, in German; Polish Ordinance of the Ministry of Health, 2015: Requirements for water at swimming pools, Journal of Laws Item 2016; the Ministry of Health).

The analysis of the microbiological tests results of the pool water shows that nanosilver solution can be successfully applied for precoating the filter bed and supporting the disinfection system.

Despite finding a large number of mesophilic bacteria in the samples of the filtrate, only 1 CFU/1ml (limit of 100 CFU/1ml) was determined in the samples of the swimming pool water.

Due to the use of the pool, a special attention was paid to the bacteriological purity and the stability of the disinfectant concentration - free chlorine and chloramine concentration as a by-product of pool water disinfection.

Keywords: nanosilver, the quality of pool water, pool water treatment technology
Comments on this paper
Elisabete Silva
Toxicity of nanosilver
Dear authors,

First of all congratulations for the good work. I'm just wondering if the nanosilver is really environmental friendly. Indeed this subject is a hot topic that concern researchers, for instant the following paper:

Molecular toxicity mechanism of nanosilver by DanielleMcShanParesh C.RayHongtaoYu

https://doi.org/10.1016/j.jfda.2014.01.010
Did you assess its toxicity? Thus your colloidal nanosilver offers other properties which enable it as a non-toxic product?

Thank you
Joanna Wyczarska-Kokot
Thank you for your interest. The product we have used in our tests is hygienically certified and is designed for the maintenance of water and liquids in technological processes.
We used a solution of colloidal silver to preserve the pool water, or rather to filter it in the pool water treatment system. As you may have noticed, the doses used did not cause the presence of silver in water above 0.008 mg / L (in pool water). Thus, there was no exposure of bathers to doses considered to be potentially toxic (Silver in drinking-water. Background document for preparation of WHO Guidelines for drinking-water quality. Geneva, World Health Organization, 2003 and Guidelines for Drinking-water Quality, World Health Organization 2011).

However, the idea of toxicity assessment of applied nanosphere in swimming pool technology is very good - Thank you very much!
Elisabete Silva
Thank you for your promptly clarifications!

Anna Lempart
Congratulations for the great work !
This simple system ensures the efficient swimming pool water treatment without the addition of an activated carbon adsorption bed. The average lifespan of this type of beds is from 3 to 5 years. After this period, they are hazardous to the environment and require special storage and disposal, that increase the cost and environmental burden resulting from the usage of this kind of beds. The application of nanosilver for swimming pool water effectively replaces the addition of the carbon layer to the main bed and consequently it allows both the reduction of the chlorine content in the swimming pool water and the avoidance of a difficult problem of utilization of the activated carbon bed.


Congratulations !
Joanna Wyczarska-Kokot
Thank you for your interest. Indeed, the huge reduction in free chlorine concentration in the tested pool circuit was a significant problem. The result of this was a significant amount of CFU bacteria in water just after filtration. That’s the cause of our idea to use nanosilver with biocidal properties, and without a negative impact on the human body, animal and the environment.


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Catrich Edlago
Nice Post
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